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Author/Creator
- United States739
- Geological Survey (U.S.)435
- Geological Survey (U.S.), issuing body381
- Project Muse166
- United States. Congress. House159
- Arizona137
- United States. Forest Service. Southwestern Region135
- United States. National Park Service130
- United States. Congress. Senate. Committee on Interior and Insular Affairs. (1948-1977)96
- Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)89
- United States. Bureau of the Census89
- United States. Bureau of Reclamation88
- United States. Congress. Senate. Select Committee on Indian Affairs82
- United States. Congress. House. Committee on Interior and Insular Affairs. (1951-1993)79
- United States. Bureau of Indian Affairs78
- United States. Geological Survey69
- Arizona. Department of Water Resources67
- University of Arizona64
- United States. Bureau of Land Management61
- United States. Congress. House. Committee on Public Lands. (1805-1951)60